Re: [PATCH 4/6] udf: convert udf_stamp_to_time and udf_time_to_stamp to use timestamps

[Marcin Slusarz <marcin.slusarz@gmail.com>]

On Wed, Feb 06, 2008 at 12:10:08PM +0100, Jan Kara wrote:
> On Tue 05-02-08 20:21:58, Marcin Slusarz wrote:
> > On Tue, Feb 05, 2008 at 04:59:56PM +0100, Jan Kara wrote:
> > > On Sun 03-02-08 19:36:09, marcin.slusarz@gmail.com wrote:
> > > > kernel_timestamp type was almost unused - only callers of udf_stamp_to_time
> > > > and udf_time_to_stamp used it, so let these functions handle endianness
> > > > internally and don't clutter code with conversions
> > >   OK, but please also rename the functions to something like
> > > udf_disk_stamp_to_time() and udf_time_to_disk_stamp() so that the name
> > > suggests that it internally handles endianess...
> > Ok, should I redo this patch or create separate patch on top of it?
>   Please, just redo this one. Thanks.

---
udf: convert udf_stamp_to_time and udf_time_to_stamp to use timestamps

* kernel_timestamp type was almost unused - only callers of udf_stamp_to_time
and udf_time_to_stamp used it, so let these functions handle endianness
internally and don't clutter code with conversions

* rename udf_stamp_to_time to udf_disk_stamp_to_time
  and udf_time_to_stamp to udf_time_to_disk_stamp

Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Cc: Jan Kara <jack@suse.cz>
---
 fs/udf/inode.c   |   45 ++++++++++++++++-----------------------------
 fs/udf/super.c   |   22 ++++++++++------------
 fs/udf/udfdecl.h |    5 +++--
 fs/udf/udftime.c |   22 ++++++++++++----------
 4 files changed, 41 insertions(+), 53 deletions(-)

diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index e464652..17674ea 100644
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -1242,16 +1242,14 @@ static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
 		inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
 			(inode->i_sb->s_blocksize_bits - 9);
 
-		if (!udf_stamp_to_time(&inode->i_atime,
-					lets_to_cpu(fe->accessTime)))
+		if (!udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime))
 			inode->i_atime = sbi->s_record_time;
 
-		if (!udf_stamp_to_time(&inode->i_mtime,
-					lets_to_cpu(fe->modificationTime)))
+		if (!udf_disk_stamp_to_time(&inode->i_mtime,
+					    fe->modificationTime))
 			inode->i_mtime = sbi->s_record_time;
 
-		if (!udf_stamp_to_time(&inode->i_ctime,
-					lets_to_cpu(fe->attrTime)))
+		if (!udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime))
 			inode->i_ctime = sbi->s_record_time;
 
 		iinfo->i_unique = le64_to_cpu(fe->uniqueID);
@@ -1262,20 +1260,17 @@ static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
 		inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
 		    (inode->i_sb->s_blocksize_bits - 9);
 
-		if (!udf_stamp_to_time(&inode->i_atime,
-					lets_to_cpu(efe->accessTime)))
+		if (!udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime))
 			inode->i_atime = sbi->s_record_time;
 
-		if (!udf_stamp_to_time(&inode->i_mtime,
-					lets_to_cpu(efe->modificationTime)))
+		if (!udf_disk_stamp_to_time(&inode->i_mtime,
+					    efe->modificationTime))
 			inode->i_mtime = sbi->s_record_time;
 
-		if (!udf_stamp_to_time(&iinfo->i_crtime,
-					lets_to_cpu(efe->createTime)))
+		if (!udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime))
 			iinfo->i_crtime = sbi->s_record_time;
 
-		if (!udf_stamp_to_time(&inode->i_ctime,
-					lets_to_cpu(efe->attrTime)))
+		if (!udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime))
 			inode->i_ctime = sbi->s_record_time;
 
 		iinfo->i_unique = le64_to_cpu(efe->uniqueID);
@@ -1412,7 +1407,6 @@ static int udf_update_inode(struct inode *inode, int do_sync)
 	uint32_t udfperms;
 	uint16_t icbflags;
 	uint16_t crclen;
-	kernel_timestamp cpu_time;
 	int err = 0;
 	struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
 	unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
@@ -1515,12 +1509,9 @@ static int udf_update_inode(struct inode *inode, int do_sync)
 			(inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
 			(blocksize_bits - 9));
 
-		if (udf_time_to_stamp(&cpu_time, inode->i_atime))
-			fe->accessTime = cpu_to_lets(cpu_time);
-		if (udf_time_to_stamp(&cpu_time, inode->i_mtime))
-			fe->modificationTime = cpu_to_lets(cpu_time);
-		if (udf_time_to_stamp(&cpu_time, inode->i_ctime))
-			fe->attrTime = cpu_to_lets(cpu_time);
+		udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
+		udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
+		udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
 		memset(&(fe->impIdent), 0, sizeof(regid));
 		strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
 		fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
@@ -1555,14 +1546,10 @@ static int udf_update_inode(struct inode *inode, int do_sync)
 		     iinfo->i_crtime.tv_nsec > inode->i_ctime.tv_nsec))
 			iinfo->i_crtime = inode->i_ctime;
 
-		if (udf_time_to_stamp(&cpu_time, inode->i_atime))
-			efe->accessTime = cpu_to_lets(cpu_time);
-		if (udf_time_to_stamp(&cpu_time, inode->i_mtime))
-			efe->modificationTime = cpu_to_lets(cpu_time);
-		if (udf_time_to_stamp(&cpu_time, iinfo->i_crtime))
-			efe->createTime = cpu_to_lets(cpu_time);
-		if (udf_time_to_stamp(&cpu_time, inode->i_ctime))
-			efe->attrTime = cpu_to_lets(cpu_time);
+		udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
+		udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
+		udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
+		udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
 
 		memset(&(efe->impIdent), 0, sizeof(regid));
 		strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
diff --git a/fs/udf/super.c b/fs/udf/super.c
index 570fe51..ab63dbb 100644
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -980,8 +980,8 @@ static void udf_load_pvoldesc(struct super_block *sb, struct buffer_head *bh)
 
 	pvoldesc = (struct primaryVolDesc *)bh->b_data;
 
-	if (udf_stamp_to_time(&UDF_SB(sb)->s_record_time,
-			      lets_to_cpu(pvoldesc->recordingDateAndTime))) {
+	if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
+			      pvoldesc->recordingDateAndTime)) {
 		kernel_timestamp ts;
 		ts = lets_to_cpu(pvoldesc->recordingDateAndTime);
 		udf_debug("recording time %04u/%02u/%02u"
@@ -1627,7 +1627,6 @@ static void udf_open_lvid(struct super_block *sb)
 	struct udf_sb_info *sbi = UDF_SB(sb);
 	struct buffer_head *bh = sbi->s_lvid_bh;
 	if (bh) {
-		kernel_timestamp cpu_time;
 		struct logicalVolIntegrityDesc *lvid =
 				(struct logicalVolIntegrityDesc *)bh->b_data;
 		struct logicalVolIntegrityDescImpUse *lvidiu =
@@ -1635,8 +1634,8 @@ static void udf_open_lvid(struct super_block *sb)
 
 		lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
 		lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
-		if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
-			lvid->recordingDateAndTime = cpu_to_lets(cpu_time);
+		udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
+					CURRENT_TIME);
 		lvid->integrityType = LVID_INTEGRITY_TYPE_OPEN;
 
 		lvid->descTag.descCRC = cpu_to_le16(
@@ -1651,7 +1650,6 @@ static void udf_open_lvid(struct super_block *sb)
 
 static void udf_close_lvid(struct super_block *sb)
 {
-	kernel_timestamp cpu_time;
 	struct udf_sb_info *sbi = UDF_SB(sb);
 	struct buffer_head *bh = sbi->s_lvid_bh;
 	struct logicalVolIntegrityDesc *lvid;
@@ -1666,8 +1664,8 @@ static void udf_close_lvid(struct super_block *sb)
 							udf_sb_lvidiu(sbi);
 		lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
 		lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
-		if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
-			lvid->recordingDateAndTime = cpu_to_lets(cpu_time);
+		udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
+					CURRENT_TIME);
 		if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
 			lvidiu->maxUDFWriteRev =
 					cpu_to_le16(UDF_MAX_WRITE_VERSION);
@@ -1852,12 +1850,12 @@ static int udf_fill_super(struct super_block *sb, void *options, int silent)
 	}
 
 	if (!silent) {
-		kernel_timestamp ts;
-		udf_time_to_stamp(&ts, sbi->s_record_time);
+		timestamp ts;
+		udf_time_to_disk_stamp(&ts, sbi->s_record_time);
 		udf_info("UDF: Mounting volume '%s', "
 			 "timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
-			 sbi->s_volume_ident, ts.year, ts.month, ts.day,
-			 ts.hour, ts.minute, ts.typeAndTimezone);
+			 sbi->s_volume_ident, le16_to_cpu(ts.year), ts.month, ts.day,
+			 ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
 	}
 	if (!(sb->s_flags & MS_RDONLY))
 		udf_open_lvid(sb);
diff --git a/fs/udf/udfdecl.h b/fs/udf/udfdecl.h
index 508be85..011feee 100644
--- a/fs/udf/udfdecl.h
+++ b/fs/udf/udfdecl.h
@@ -204,7 +204,8 @@ extern short_ad *udf_get_fileshortad(uint8_t *, int, uint32_t *, int);
 extern uint16_t udf_crc(const uint8_t *, uint32_t, uint16_t);
 
 /* udftime.c */
-extern struct timespec *udf_stamp_to_time(struct timespec *dest, kernel_timestamp src);
-extern kernel_timestamp *udf_time_to_stamp(kernel_timestamp *dest, struct timespec src);
+extern struct timespec *udf_disk_stamp_to_time(struct timespec *dest,
+						timestamp src);
+extern timestamp *udf_time_to_disk_stamp(timestamp *dest, struct timespec src);
 
 #endif				/* __UDF_DECL_H */
diff --git a/fs/udf/udftime.c b/fs/udf/udftime.c
index 12fae6c..5f81165 100644
--- a/fs/udf/udftime.c
+++ b/fs/udf/udftime.c
@@ -85,14 +85,16 @@ extern struct timezone sys_tz;
 #define SECS_PER_HOUR	(60 * 60)
 #define SECS_PER_DAY	(SECS_PER_HOUR * 24)
 
-struct timespec *udf_stamp_to_time(struct timespec *dest, kernel_timestamp src)
+struct timespec *udf_disk_stamp_to_time(struct timespec *dest, timestamp src)
 {
 	int yday;
-	uint8_t type = src.typeAndTimezone >> 12;
+	u16 typeAndTimezone = le16_to_cpu(src.typeAndTimezone);
+	u16 year = le16_to_cpu(src.year);
+	uint8_t type = typeAndTimezone >> 12;
 	int16_t offset;
 
 	if (type == 1) {
-		offset = src.typeAndTimezone << 4;
+		offset = typeAndTimezone << 4;
 		/* sign extent offset */
 		offset = (offset >> 4);
 		if (offset == -2047) /* unspecified offset */
@@ -100,21 +102,21 @@ struct timespec *udf_stamp_to_time(struct timespec *dest, kernel_timestamp src)
 	} else
 		offset = 0;
 
-	if ((src.year < EPOCH_YEAR) ||
-	    (src.year >= EPOCH_YEAR + MAX_YEAR_SECONDS)) {
+	if ((year < EPOCH_YEAR) ||
+	    (year >= EPOCH_YEAR + MAX_YEAR_SECONDS)) {
 		return NULL;
 	}
-	dest->tv_sec = year_seconds[src.year - EPOCH_YEAR];
+	dest->tv_sec = year_seconds[year - EPOCH_YEAR];
 	dest->tv_sec -= offset * 60;
 
-	yday = ((__mon_yday[__isleap(src.year)][src.month - 1]) + src.day - 1);
+	yday = ((__mon_yday[__isleap(year)][src.month - 1]) + src.day - 1);
 	dest->tv_sec += (((yday * 24) + src.hour) * 60 + src.minute) * 60 + src.second;
 	dest->tv_nsec = 1000 * (src.centiseconds * 10000 +
 			src.hundredsOfMicroseconds * 100 + src.microseconds);
 	return dest;
 }
 
-kernel_timestamp *udf_time_to_stamp(kernel_timestamp *dest, struct timespec ts)
+timestamp *udf_time_to_disk_stamp(timestamp *dest, struct timespec ts)
 {
 	long int days, rem, y;
 	const unsigned short int *ip;
@@ -125,7 +127,7 @@ kernel_timestamp *udf_time_to_stamp(kernel_timestamp *dest, struct timespec ts)
 	if (!dest)
 		return NULL;
 
-	dest->typeAndTimezone = 0x1000 | (offset & 0x0FFF);
+	dest->typeAndTimezone = cpu_to_le16(0x1000 | (offset & 0x0FFF));
 
 	ts.tv_sec += offset * 60;
 	days = ts.tv_sec / SECS_PER_DAY;
@@ -148,7 +150,7 @@ kernel_timestamp *udf_time_to_stamp(kernel_timestamp *dest, struct timespec ts)
 			 - LEAPS_THRU_END_OF(y - 1));
 		y = yg;
 	}
-	dest->year = y;
+	dest->year = cpu_to_le16(y);
 	ip = __mon_yday[__isleap(y)];
 	for (y = 11; days < (long int)ip[y]; --y)
 		continue;
-- 
1.5.3.7